Patent · US Active

Dual-clutch transmission parking brake disengaging method of a vehicle

US10053098B2 · kind B2 · utility

1Cited by

0References

5Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Andreas Feiner · Isny im Allgäu, DE
Alexander Hoffmann · Neckargemünd, DE
Thomas John · Augsburg, DE

Key dates

Filing date	Sep 17, 2016
Grant date	Aug 21, 2018
Priority date	—
Expiry date	Sep 17, 2036

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/62
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A method for disengaging a parking lock of a dual-clutch transmission of a motor vehicle with at least one drive unit is provided. The method includes, upon detection of an absolute value of a road inclination along a longitudinal axis of the motor vehicle exceeding a predetermined threshold and upon actuation of a selector lever for disengaging the parking lock prior to disengagement of the parking lock, issuing a torque request to the drive unit and closing a power-shifting clutch of the dual-clutch transmission with an engaged gear in a sub-transmission to which the power-shifting clutch is allocated. A torque transferred by the power-shifting clutch as a consequence of closing the power-shifting clutch and the torque request to the drive unit is a relief torque. The torque request to the drive unit and the closed power-shifting clutch are selected to counteract a torque, supported by a parking lock pawl, applying with an engaged parking lock by drive wheels on an output side at the transmission.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.